1、煤矿开采与安全外文翻译附录2Coal mining and security, Keyword : three soft coal bed; Mine pressure show features one . The three soft coal bed on top of coal mine located pressure of study 1, located about 12,090, located in the Great West Yugou mining bureau hoisted two wells below a District East, West 2 West t
2、ransport belts down, 2 mining areas in east-west border to stop a thread. located 420 m towards the average length, 100 m long trend. The second one, located stoping coal bed, Fucun Group in Shanxi Erdiexi bottom. Because coal bed sediment environment and the impact of later tectonic movements, unev
3、en thickness, larger changes, stoping coal in the context of a thin belt presence (vice alley in de 40180 m above, the thickness of a coal bed 01. 6 m), to bring a certain degree of difficulty stoping work. coal bed inclination to 714 meridian east, the average thickness of 4 coal bed. 62 m, the coa
4、l is of relatively for anthracite, coal is of relatively soft, low intensity and easy to run down. Direct roof for the stones, mudstone and sandy mudstone; direct-bed for the stones, axes; In direct top, - bed between local presence and pseudo - pseudo-top end, the variable quality mudstone or mudst
5、one mostly carbon, thickness generally less than 0. 5 m. 2 mine pressurised observation content and layout mine detection point pressure is the main purpose of observing large Yugou Mining Bureau three soft coal bed guns a coal located on top of the pressure distribution pattern and advance to press
6、ure step from the initial roof, pressure to step away from the cycle and intensity. major observational content pit props pressure, located cradles pressure. At the same time, you should also pay attention to the observation of a face, supporting macroeconomic situation changes; Watch top coal broke
7、n off after the roof and the top of the coal shed Yunyi 3 located advance pressure distribution characteristics 3. 1 observation data collation, located back alley advance wind pressure observation period, Underground daily sent people to the station pressure gauge readings recorded, measuring stati
8、on located to the distance, macro-observation plane lane, alley and surrounding rock changes in the wind conditions and intense deformation measurements relating to the district, located in the distance. After calculation handling objects charts. 3. 2 advance distribution of pressure from the wind p
9、ower plant Lane can finally curve, caused by coal mining is much pressure to advance work before side 34 m, 34 m at work before the side street will be located within the stope advance pressure. advance pressure peaks in the work zone before side 912 m, a significant increase in the volume of pit de
10、formation, top Jing fence fractures increase, and sometimes a coal business, a broken cinder ended. 34 m away from the side before the work stoppage that could advance pressure from the impact of a stress stability zone. The two coal bed belonging to one of three soft instability thick coal bed, the
11、 old top to pressure evident, leading to work on stress distribution side before extended stress peaks, located far away from the district, stress concentration factor is, However, the relative proximity of the larger pit surrounding rock, to reduce the excessive stope pillars surrounding rock defor
12、mation and destruction, and give full play to the role of supporting the surrounding rock deformation control, work before the two parties within 21 m alley to advance support for. 4 coal mining located roof to pressure of 4. 1 mine coal mining is much pressure observation data collection and proces
13、sing for about guns taken on the top and roof load coal mine, located cradles pressure distribution patterns, 12,090 wells located in the red flag for the use of pressure-Yaliji located cradles a half load for the site observations that after calculating the results processed figure 3-Figure 5 below
14、. Figure 3 is the backbone of the chassis is much data to load for X-coordinate observation cycle, weighted average time to load a vertical structure coordinates. can be seen from Figure 3, located along the direction of a cyclical movement roof phenomenon cycle to pressure to step away from 19 m. F
15、igure 4 is located opposite to the X-coordinate long to normal when the three pillars of load testing station for the average vertical coordinates. by Figure 4 shows that Coal is much more along the direction of the top (board) campaign has begun mine pressure area characteristics, the greatest pres
16、sure on the middle and upper occasions, the smallest part. 4. 2 stope mine pressure manifested by the basic law of observational data analysis stope mine pressure show the following obvious features : (1) Overall, supports early resistance do not hold power and work great. As this is much direct con
17、tact with the sphere payments Liang was named top soft coal, coupled with the roof is also very soft, in the time frames established in the early extension to be able to improve. Average power for itself in early 226. 38227. 36 kN/ to shed for resistance work rated 15. 4 %16. 8% Working resistance a
18、veraged 252. 84272. 44 kN/ to shed for resistance work rated 17. 2 %18. 5% to pressure, the maximum resistance for 372. 4 kN/ to shed, 23% rated the work of resistance. 3% The average intensity of support for the 102. 3144. 5 kN/ map. problems are caused mainly coal-bed and the top is too soft and m
19、onomer pillar inserted at the end of serious (some pillars inserted to the end of 700 mm or more), sometimes steel girder also drilled top. lower support body rigidity, limiting the ability to play a supporting. (2) In the course of supporting a payload located in the non-violent change, the pressur
20、e to show moderate and mine, to suppress evidence cycle (compared with the stratification changes evident exploitation), show a ground movement of rocks not violent. (3) to the old top of the initial pressure to step away from about 19 m, pressure to the end of the period cradles inserted a general
21、increase in the volume, the deepest reached 95 cm; coal Pik films to serious, the deepest reach 0. 5 m; Guarding includes fractures increasing pressure to show quick to shed mine obvious. (4) roof cycle to pressure to step away from the general 612 m, with an average of 9 m. to pressure, National av
22、erage load rate and peak load generally 1. 11. 3 (5) work surface, China, and three offices, located under the same basic structure resistance. This was mainly due to top coal pine broken, the roof vulnerable to collapse down, the two lane or coal, do not appear on basic export Kok Department triang
23、ular arc - top. stope roof collapse or even the whole, extraction region filled with better results. (6) roof pressure on the former than coal or coal, small, or an average of 237 coal ago. 16 kN/ to shed, or an average of 268 after coal. 52 kN/ to shed. This is mainly because on the former coal ext
24、raction region of the roof was broken up and top coal is filled with more in a market created a-bed, cradles, broken down objects, top coal composition balance system, in this system, supporting the main support coming from the top of the coal and the roof spaces. or coal, broken down by helicopter
25、after the original space was filled with top coal deplete, and the roof to collapse down to completely backward, the original balance system is damaged, and that the plant should not only support higher top coal Additional support also in the roof above the pressure and therefore the power plant hav
26、e increased. However, the side roof over a soft, with a Sui collapse, not a large overhang top, the structure will not collapse down the impact hazard. 5 knot on top of 12,090 guns a low load coal plant, located, mine pressure appeared evident. this is because the coal bed three soft coal beds, pill
27、ars inserted at the pressure seriously, cradles effectiveness has not been fully exploited; On the other hand, because the roof is much thicker, with a then - and extraction region filled with better results. In view of this, we should increase the coverage of a support cut and raise the pillars of
28、power in the early intention to increase plant stability. Second, Coal Mine gas explosion accident electrical current incentives and measures, most of our coal upward inclination to move boring, coal makes such a partial or total removal of the dumping of the top, the reason is to use gravity to pas
29、s out of coal mining. Because of spillover coal mine gas air mass lighter than air, so gas gas in the air by buoyancy role will be along the street, dumping flows to the top, gather the top of the highest point in the pit (coal mining side) near a 5%15% size than for the gas-air mixture can be explo
30、sive gas. Therefore, coal, gas gas combined with the dumping pit top since deteriorated role. At present, Chinas coal mine ventilation methods used may not be the complete elimination of this form of burglary mixed gas, which is one of the main reasons for such coal mine gas explosion. It should be
31、said that after the coal mine gas explosion in the relevant departments and personnel operations of a number of painful lessons learned, which has also taken some measures, but the explosion is still unabated, and this shows that in the previous incidents summed up the reasons, there are major under
32、lying factors induced. In recent years many cases of the author on coal gas explosion accident and the cause of the accident was announced incomplete statistics, the analysis found that the coal mine gas explosion accident subjective and objective factors are manifold, but the most fundamental facto
33、r than direct two main aspects : First, the partial loss of gas concentration reached explosive limits; in the presence of one to two basis of many types of electrical equipment error or mine operation against induced electrical spark or explosion due. To the elimination of one of the parties concerned have made fruitful discussions on the following two key to the
